Shell prompt w/user, directory, git branch with dirty status

.bashrc

tb_is_git_dirty() {
    git_status="$(git status 2> /dev/null)"
    if [[ ${git_status} =~ "nothing to commit" ]]; then
        return 0
    else
        return 1
    fi
}
__tb_git_status() {
    git_status="$(git status 2> /dev/null)"
    git_branch="$(git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/')"
    if [ -n "${git_status}" -a -n "${git_branch}" ]; then
        if __tb_is_git_dirty; then
            echo " (${git_branch})"
        else
            echo " (${git_branch}*)"
        fi
    fi
}
tb_git_status_color() {
    if tb_is_git_dirty; then echo -e "\x1B[32m"; else echo -e "\x1B[1;32m"; fi
}
export PS1="\[\e[1;30m\]\u \[\e[0;35m\]\W\[\$(tb_git_status_color)\]\$(tb_git_status)\[\e[m\] $ "

screenshot.png

For alternative colors, see https://en.wikipedia.org/wiki/ANSI_escape_code#Colors